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I have 4lbs of 800x, a whole bunch of 180gr. cast bullets and can't find any Data to stuff this in a .40s&w. Even the bullet maker, laser-cast, cannot help me here, and IMR has not answered my e-mail.
They list a 401043 175gr at 1.125" OAL from 5.6-7.4gr (853-974fps) and a 401638 175gr at 1.100" OAL from 5.8-7.6gr (878-996fps). Both use a WSP primer.
ETA: I'd start with the conservative 5.6gr and work up. Load to the longest OAL that will feed in your gun, but at least 1.125".
180 Gr Bullet
IMR - - - 800X - - - 7.2 gr
Speer- - - 800X- - - 7.9 gr
Hornady- 800X - - - 7.5 gr
I found that 6.5 gr of 800X with cast 180gr Zero or 180gr Laser Castand with 180gr Montana Gold yielded excellent accuracy!
It's been a while, but as I recall, 5.6 gr loads were very weak and sometimes fizzled bullet and unburned powder out the barrel. Ty it though as your weapons may be different.
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